Monolithic Power Systems Inc. MPQ8632DGLE-12-P

Overview

MPQ8632DGLE-12-P from Monolithic Power Systems is a fully integrated, high-frequency synchronous step-down converter delivering 12A output current with 19.6mΩ high-side and 5.2mΩ low-side MOSFETs, operating from 4.5V–18V input and supporting adjustable output from 0.611V to 13V. It employs adaptive Constant-On-Time (COT) control for ultrafast transient response in telecom base stations and server power rails.

For engineers reviewing the MPQ8632DGLE-12-P datasheet, MPQ8632DGLE-12-P pinout, MPQ8632DGLE-12-P application, or MPQ8632DGLE-12-P equivalent, key selection criteria include its programmable 200kHz–1MHz switching frequency, non-latch over-current/over-voltage protection, soft-start/shut-down timing control, and QFN(3×4mm) thermal performance with θJA = 46°C/W.

Technical Context

The MPQ8632DGLE-12-P implements adaptive COT control without an external oscillator, using FREQ pin voltage feed-forward to maintain stable switching frequency across input variations. Its dual current-limit architecture includes valley current limit (12–18A) and negative current limit (–4A to –1A) for robust light-load and overload handling.

It integrates internal 4.8V VCC LDO (bypassable with external 5V bias), open-drain PG signal with 2.5ms delay and ±10% trip thresholds, and proprietary switching loss reduction enabling >95% peak efficiency at 12A/1V output. Pre-bias startup and monotonic soft-shutdown ensure safe operation into pre-charged loads.

Key Specifications

Pinout & Package

MPQ8632DGLE-12-P is housed in a thermally enhanced QFN-16 package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad. The package supports ≤125°C junction operation and requires ≥2.7W continuous power dissipation derating above +25°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Compared with MPQ8632DGLE-6, the MPQ8632DGLE-12-P delivers double output current in identical footprint but trades 1.4mΩ lower LS R_DS(ON) for tighter thermal limits; versus MPQ8632GL-12, it sacrifices 8°C/W thermal resistance for 25% smaller PCB area-critical for space-constrained telecom modules.

Availability

MPQ8632DGLE-12-P is available at Aetrix Electronics and suitable for telecom base stations, server power delivery, flat-panel display subsystems, and distributed industrial power systems requiring stable component supply across multi-year production cycles.

Supply support for MPQ8632DGLE-12-P includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with over two decades of leadership in DC-DC conversion, motor drivers, and LED lighting controllers.

The MPQ8632 series belongs to MPS's high-current synchronous buck converter product line, designed specifically for high-density, high-efficiency point-of-load applications in networking, computing, and industrial infrastructure where thermal and layout constraints dominate design trade-offs.

FAQ

What is the minimum input voltage supported by MPQ8632DGLE-12-P?

The device operates from 4.5V to 18V when using internal VCC bias. With external 5V bias applied to VCC, the minimum input voltage drops to 2.5V-enabling compatibility with Li-ion battery-powered systems and low-voltage intermediate buses. This dual-bias capability is confirmed in the Absolute Maximum Ratings and Recommended Operating Conditions tables.

How is switching frequency programmed on the MPQ8632DGLE-12-P?

Frequency is set by connecting a resistor between the FREQ pin and the IN pin. Using RFREQ = 453kΩ yields ~500kHz at VIN = 12V, per the equation FSW(kHz) = 10⁶ / [6.1 × RFREQ(kΩ) × (VIN(V) − 0.4)]. The feed-forward connection stabilizes frequency across input variation, maintaining ±5% tolerance from 4.5V to 18V input.

Does MPQ8632DGLE-12-P support pre-biased output startup?

Yes. The IC detects pre-bias on the FB pin during enable assertion and holds both high-side and low-side MOSFETs off until the SS capacitor voltage exceeds the sensed output voltage. This prevents reverse current flow and ensures monotonic ramp-up, verified in the "Pre-Bias Startup" section of the datasheet.

What is the purpose of the AGND and PGND separation?

AGND serves as the quiet reference for feedback, soft-start, and internal comparators; PGND carries high di/dt return currents from IN, SW, and PGND pins. Separating them prevents noise coupling into regulation circuitry-layout guidelines require separate copper pours joined only at a single point near the IC's thermal pad.

Can the MPQ8632DGLE-12-P be used without an external bootstrap capacitor?

No. A 0.1μF X7R ceramic capacitor must be placed between BST and SW pins to form the floating supply for the high-side gate driver. Omitting it causes immediate failure of the HS-FET turn-on, resulting in no output regulation. This requirement is explicitly stated in the PIN FUNCTIONS table and BLOCK DIAGRAM.

What is the maximum allowable output capacitance during soft start?

For output capacitance exceeding 330μF, a minimum 4.7nF SS capacitor is required to prevent current-limit triggering during ramp-up. The SS time is calculated as T_SS(ms) = C_SS(nF) × V_REF(V) / 20μA, ensuring controlled inrush into large bulk capacitors without violating valley current limit.

Is MPQ8632DGLE-12-P RoHS-compliant and lead-free?

Yes. All MPS parts, including MPQ8632DGLE-12-P, are lead-free and comply with the RoHS directive. Green status verification is available on the MPS website under Products → Quality Assurance, confirming exemption from Annex II substances and full compliance with EU Directive 2011/65/EU.